Sounding Signals for Sub-Meter Base Station Localization

ABSTRACT

Systems and methods are disclosed for providing base station localization. In one embodiment the system includes a network including a base station such as a 5G gNodeB (gNB); a Hetnet Gateway (HNG) in communication with the gNB, wherein the HNG includes a location server and wherein the HNG virtualizes and abstracts a collection of base stations and provides a complex network under its purview as a simple base station to a mobile packet core network; a plurality of Hyper Sync Network (HSN) nodes in communication with the gNB and the HNG, wherein the plurality of HSN nodes listen to User Equipments (UEs) to locate the UEs and to synchronize clocks on the gNB with the collection of HSN nodes or other gNBs; and an Evolved Serving Mobile Location Center (E-SMLC) server in communication with the HNG and for reporting the location of a UE.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims priority under 35 U.S.C. § 119(e) to U.S.Provisional Pat. App. No. 63/026,189, filed May 18, 2020, titled“Sounding Signals For Sub-Meter Base Station Localization” which ishereby incorporated by reference in its entirety for all purposes. Thisapplication also hereby incorporates by reference, for all purposes,each of the following U.S. Patent Application Publications in theirentirety: US20170013513A1; US20170026845A1; US20170055186A1;US20170070436A1; US20170077979A1; US20170019375A1; US20170111482A1;US20170048710A1; US20170127409A1; US20170064621A1; US20170202006A1;US20170238278A1; US20170171828A1; US20170181119A1; US20170273134A1;US20170272330A1; US20170208560A1; US20170288813A1; US20170295510A1;US20170303163A1; and US20170257133A1. This application also herebyincorporates by reference U.S. Pat. No. 8,879,416, “Heterogeneous MeshNetwork and Multi-RAT Node Used Therein,” filed May 8, 2013; U.S. Pat.No. 9,113,352, “Heterogeneous Self-Organizing Network for Access andBackhaul,” filed Sep. 12, 2013; U.S. Pat. No. 8,867,418, “Methods ofIncorporating an Ad Hoc Cellular Network Into a Fixed Cellular Network,”filed Feb. 18, 2014; U.S. patent application Ser. No. 14/034,915,“Dynamic Multi-Access Wireless Network Virtualization,” filed Sep. 24,2013; U.S. patent application Ser. No. 14/289,821, “Method of ConnectingSecurity Gateway to Mesh Network,” filed May 29, 2014; U.S. patentapplication Ser. No. 14/500,989, “Adjusting Transmit Power Across aNetwork,” filed Sep. 29, 2014; U.S. patent application Ser. No.14/506,587, “Multicast and Broadcast Services Over a Mesh Network,”filed Oct. 3, 2014; U.S. patent application Ser. No. 14/510,074,“Parameter Optimization and Event Prediction Based on Cell Heuristics,”filed Oct. 8, 2014, U.S. patent application Ser. No. 14/642,544,“Federated X2 Gateway,” filed Mar. 9, 2015, and U.S. patent applicationSer. No. 14/936,267, “Self-Calibrating and Self-Adjusting Network,”filed Nov. 9, 2015; U.S. patent application Ser. No. 15/607,425,“End-to-End Prioritization for Mobile Base Station,” filed May 26, 2017;U.S. patent application Ser. No. 15/803,737, “Traffic Shaping andEnd-to-End Prioritization,” filed Nov. 27, 2017, each in its entiretyfor all purposes, having attorney docket numbers PWS-71700US01, US02,US03, 71710US01, 71721US01, 71729US01, 71730US01, 71731US01, 71756US01,71775US01, 71865US01, and 71866US01, respectively. This document alsohereby incorporates by reference U.S. Pat. Nos. 9,107,092, 8,867,418,and 9,232,547 in their entirety. This document also hereby incorporatesby reference U.S. patent application Ser. No. 14/822,839, U.S. patentapplication Ser. No. 15/828,427, U.S. Pat. App. Pub. Nos.US20170273134A1, US20170127409A1 in their entirety.

BACKGROUND

Current approaches for positioning, navigation and timing (PNT) inside awarehouse are not sufficient.

4G: Best in class 4G LTE-based localization (without use of WiFi or GPS)is around 500 feet (typically it is much worse in practice).

5G: has five times the bandwidth as 4G, and even the best solutionsclaim at best 50 feet of theoretical location error. None of theseapproaches are suitable for warehouse localization. A promisingtheoretical approach promises at best 10 feet accuracy using a singlebase station. In our baseline solution, we estimate our approachprovides sub-meter accuracy or within 3 feet, and our approach andcoverage area can be further improved with additional PACE listeningnodes.

RFID: is a commercially popular approach that is low cost but has veryshort range. Passive ID has very short range and location error is high(RFID tag is “somewhere in vicinity” of RFID tag reader). Active RFIDhas better range (“somewhere in this large room”) but does not solve thelocation problem.

Wi-Fi and Bluetooth based tracking has better range (50 feet) and strongaccuracy but does qualify as a 5G-solution, nor does it have ourproposed accuracy (unless when combined with our HSN technology).

SUMMARY

A 5G Hyper Sync Localization (HSL) system is disclosed that enhances 5GgNodeBs to demonstrate sub-meter (better than LTE or the 5G standard)localization accuracy of standard and unmodified 5G signal sources fromUser Equipment (UEs) by enabling ultra-high precision timesynchronization between 5G cellular base stations, without using anyadditional wired infrastructure. As a further enhancement we offer theability to geolocate WiFi devices, with the same accuracy using the samehardware platform.

In one embodiment, a system providing base station localization includesa network including a base station; a Hetnet Gateway (HNG) incommunication with the base station, wherein the HNG includes a locationserver and wherein the HNG virtualizes and abstracts a collection ofbase stations and provides a complex network under its purview as asimple base station to a mobile packet core network; a plurality ofHyper Sync Network (HSN) nodes in communication with the base stationand the HNG, wherein the plurality of HSN nodes listen to UserEquipments (UEs) to locate the UEs and to synchronize clocks on the basestation with the collection of HSN nodes or other base stations; and anEvolved Serving Mobile Location Center (E-SMLC) server in communicationwith the HNG and for reporting the location of a UE.

In another embodiment a method for providing base station localizationincludes receiving, at a Hetnet Gateway (HNG) from an Evolved ServingMobile Location Center (E-SMLC) server located in a network, a requestfor a location of a User Equipment (UE); issuing, by the HNG to a basestation instructions to schedule a Sounding Reference Signal (SRS)transmission for the UE; issuing, by the HNG, instructions to aplurality of Hyper Sync Network (HSN) nodes to listen for the SRStransmission from the UE; transmitting, by the UE at an appointed time,the SRS transmission; listening, by the HSN nodes, for the SRStransmission and estimating a delay in receiving the transmissionagainst a reference time; reporting, by the HSN nodes, the delay asmetadata to the HNG; determining, by the HNG from the metadata, alocation of the UE relative a location of the base station; andreporting, by the e-SMLC, the location of the UE.

In another embodiment a non-transitory computer-readable mediacontaining instructions for providing base station localization which,when executed, cause a system to perform steps comprising receiving, ata Hetnet Gateway (HNG) from an Evolved Serving Mobile Location Center(E-SMLC) server located in a network, a request for a location of a UserEquipment (UE); issuing, by the HNG to a base station instructions toschedule a Sounding Reference Signal (SRS) transmission for the UE;issuing, by the HNG, instructions to a plurality of Hyper Sync Network(HSN) nodes to listen for the SRS transmission from the UE;transmitting, by the UE at an appointed time, the SRS transmission;listening, by the HSN nodes, for the SRS transmission and estimating adelay in receiving the transmission against a reference time; reporting,by the HSN nodes, the delay as metadata to the HNG; determining, by theHNG from the metadata, a location of the UE relative a location of thebase station; and reporting, by the e-SMLC, the location of the UE.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a diagram showing cell tower location estimation.

FIG. 2 is a diagram showing self-organizing hyper sync mesh network, inaccordance with some embodiments.

FIG. 3 is a diagram showing an example 3D position mapping capability,in accordance with some embodiments.

FIG. 4 is a diagram showing a T-GPS mode, in accordance with someembodiments.

FIG. 5 is a diagram showing a subframe with SRS transmission, inaccordance with some embodiments.

FIG. 6 is diagram of a HSL and SRS system, in accordance with someembodiments.

FIG. 7 is a flow diagram for sounding signals for sub-meter base stationlocalization, in accordance with some embodiments.

DETAILED DESCRIPTION

Sounding Reference Signals (SRS) that UE transmits for the sake ofChannel Estimation and other needs can be used to measure the Time ofArrival at Base Stations. 5G seems to have expanded the SRS features sothat it can occupy wider bandwidth (BW) and multiplex to capturemultiple users at once, etc. This allows a good means to do Uplink TDOAfor UE positioning without requiring any UE involvement. In order torealize this network-based high-precision positioning the followingfeatures would be required.

All the listening BSs will need to be highly TimeSynchronized—PhasorLab's HSN is an excellent candidate for this need(Wireless 1588 so to speak). U.S. patent application Ser. Nos.14/043,789, 15/235,052, and 15/495,972 are hereby incorporated byreference in their entirety.

Since it's likely that there are not enough BSs to produce TDOAmeasurements for a given UE location, we′d like to propose to deploy“Listening-Only Base Stations” which is part of the network but onlyresponsible for (a) maintaining Time Sync and (b) measuring the arrivaltime of UE signals based on their SRS packets.

These time stamping data can be sent to eNB or other main network serverto run positioning algorithms and compile position data for all UEs.

The Sync and Localization Problem: Modern cellular base stations usemicrosecond-level time synchronization between each other. Our team'sbreakthrough innovation is our ability to enable nano-second level syncwirelessly (1000× better time resolution than LTE). This is thefundamental building block of our proposed new innovations realized byHSL.

GPS does not work everywhere, and in general it is not accurate indoorsor underground. GPS can be jammed or spoofed by even amateur hobbyiststoday. There is a strong interest in securely tracking location ofindividuals today, because of the risk of infection from others we comewith 6 feet of contact for new diseases such as COVID-19.

Location or position detection algorithms that do not use GPS typicallymeasure the time it takes to travel from UEs to multiple base stations.Most algorithms require at least three base stations to cooperate todetermine location. HSL does too, but instead of expensive full basestations, we augment our location coverage areas of interest withinexpensive wireless HSN-nodes that act as 5G listeners or sniffers.Thus our solution needs only one HSL-compatible gNodeB and at least 2more HSN devices in the range of the 5G UE that we wish to track.

The sync quality between base stations (4G, 5G, and even Wi-Fi),directly impacts estimation of location quality, because the accuracy ofthese algorithms are limited by the speed of cellular signals, which isthe same as the speed of light. In 1 ns, light will travel 0.3 meters orjust under 1 foot in distance. Thus, the higher the sync quality, thebetter the precision.

Location precision also depends on other factors such as thelocalization algorithm used, degrees of freedom, density of locationsensors and geometry, indoor or outdoor use, and so forth. Most 4G celltowers use GPS-trained clocks that have 15 ns of drift at minimum. Even5G base stations that will be connected by fiber optic will experiencesync errors due to routers and other equipment in the path between themthat can stretch to miles. Any solution that has more than 5 ns of syncaccuracy cannot do better than 1 meter in location accuracy.

Team Innovations: Our 3GPP and ORAN-standards-compatible Hyper SyncLocalization (or HSL) solution builds upon our team's innovative HyperSync Network (HSN) technology that has demonstrated jamming-resistantsub-nanosecond wireless time sync (without using fiber optic cable).

A new HSL solution is disclosed suitable for a ORAN-compliant 5G gNodeb.One key innovation of our approach is that we will not require anymodification to 5G standards or 5G handsets or other User Equipment(UEs). In addition to providing better sync, a subset of HSL nodes willalso double as additional 5G listen-only nodes which increasespositional accuracy and coverage as needed especially in indoorscenarios.

In addition, our HSL proposal includes an innovative enhancement add-onusing the same Hardware:

1) Localization of inexpensive WiFi tags. Wi-Fi chips are 10× cheaperthan 5G UEs. They better range than RFID and allow secure bidirectionalcommunications to enable next generation of smart Warehouse sensors.Imagine a $25 WiFi Tag that can securely warn the warehouse when the boxit is sitting on is higher than a safe storage temperature, and alsoexactly where it is located.

2) Additional research into improved location accuracy for RF clutteredindoor environments through hardware level improvements that target bothsync and location accuracy.

Innovative Claims

1) Sub-meter accuracy for 5G-only Cellular Localization (50× better thanLTE, 10× over 5G spec)

2) Requires no modifications to UEs or 3gPP standards (All new featuresare implemented only in our gNodeBs and wireless HSN relays and will beindustry-standard ORAN compatible)

3) Nano-second sync between 5G base-stations (current standard even for4G/5G is 20 nano-seconds of sync errors due to reliance on GPS)

3) Fully Wireless Time Sync between 5G Base stations without using IEEE1588 or fiber optic cables enables ad hoc remote/rural untethered 5Gdeployments (5G sync and localization solutions use expensive fiberoptic cable)

Innovative Claims in Optional Enhancements:

1) Single gNodeB-based tracking using beam forming (Option 1)

2) WiFi-Tag tracking which is more accurate and cost effective (Option2)

The inventors have previously invented the Hyper Sync Network (HSN), assync platform which provides an alternative to GPS, and is also a timeand frequency distribution system (TFDS) with sub-nanosecond accuracyand sub meter accuracy.

The Fundamental Problem: Where Am I? Where are You?

Today the world relies on location information to conduct commerce andwarfare. Soldiers must be tracked for Situational Awareness (SA). Assetssuch as arms and equipment of all shapes and sizes must be tracked inwarehouses and while on the move. In some applications, you want totrack all your assets, while in others, you just need to self-localizeand identify your own location in 2D or 3D space while indoor oroutdoor.

There are many different ways to localize an asset. GPS and GNSS-basedsolutions are very popular and have enabled industries like Uber andwill soon enable drone-based delivery services. The key benefit of GPSis low cost and outdoor accuracy, but the downside is lack of securityagainst jamming and spoofing.

Thus, localization approaches independent of GPS are of criticalinterest.

Fortunately, there are multiple alternatives includingBluetooth/WiFi-based tracking and cellular localization for 4G/LTE andsoon ubiquitous 5G systems.

Each alternative approach can be qualified on three dimensions:

1) Accuracy 2) Security 3) Cost

Cellular Localization: Today 4G LTE solutions without using the GPSmodule on the phone or WiFi localization, can use Time Difference ofArrival of UEs to geolocate them.

They can be triangulated and localized by multiple cell towers (example:during 911 call tracebacks) to within 100 meters of their actuallocation (at best due to 50 nanosecond sync accuracy).

In LTE, the max channel size is 20 Mhz, in 5G it is 100 Mhz. Based onthis improvement and other algorithm advances, the 5G standard promisesto improve location error to 20m. However, our team has yet to seedemonstrations and confirmed 3rd party evaluation of this claim.

In addition, all cellular base stations today need a time-sourcereference clock to enable system level sync between towers and with eachindividual handset. Typically this is accomplished using GPS signals. Analternative is to receive a timing signal using the IEEE1588 standardover fiber optic cable or ethernet. The first approach is dependent onGPS availability and the latter is expensive. The third lesser knownissue is clock accuracy/resolution and clock skew. If we can increasethe accuracy of clock sync and resolution, we can immediately increaselocation accuracy. However the base 5G standard only allows microsecondlevel clock resolution and sync quality.

Our HSL Goal: We propose to significantly improve the ability togeolocate 5G devices without modifying User Equipment (UEs) to sub-meterlevel accuracy and the timing synchronization capabilities of 5G Basestations to sub-nanosecond accuracy. We also propose to implement oursolution within the current 3gpp standards specification to ensuremaximal compatibility of our proposed enhancement which requireshardware and software changes at the base station.

Warehouse Tracking and AR/VR Applications: Localization is particularlyimportant for Warehouse Asset Tracking and for AR/VR.

Most warehouses rely on WiFi tags, IoT tags, Bluetooth sensors, RFIDtags, barcodes, video tracking and more often than not manual trackingof assets.

Although most AR/VR systems rely on Infrared sensors, LIDAR, localbeacons, 5G opens up new possibilities for global object locations thatcan be shared by multiple users in both indoor and outdoor scenarios.

Traditionally this is done using visual processing tools that are CPUintensive since each scene or view frame must be analyzed frame by frame(times two for stereo-vision camera sensors). To simplify the process,many companies provide “AR stickers” that are easy to detect. Ourapproach is to let object announce exactly where they are using 5Gcompatible SRS signals.

HSL Benefits: Using our HSL localization, we bring two distinct 5Gadvantages to AR/VR in addition to CPU-load reduction by avoiding andoffloading video processing subroutines, and this reduced latency:

1) Every user knows exactly where they are with 50× more accuracy thanLTE-based Time of Arrival estimates both indoors and outdoors, thusproviding self-location context. Many VR exercises allow teams to movearound in large indoor spaces and many AR demos are done in large indooror outdoor spaces.

2) The second is that other 5G UEs (and optionally WiFi-tag equippedassets) can be located as they move. For military training exercises,imagine a Red force is moving, then blue forces can score a kill basedon actual location on the body where a virtual missile will hit and notjust within 100 feet of that target!

Similarly, location is important for many future AR/VR-supportedapplications. Using our localization this drone can now fly anywherewith cm level precision even without the drone's GPS sensors active.This is critical because GPS can be easily spoofed or jammed using COTSsolutions that cost less than $300 to buy, but is illegal to use[https://www.kaspersky.com/blog/gps-spoofing-protection/26837/].

ORAN as 5G Disruption Catalyst: ORAN or Open RAN is a standardizedinterface that promotes interoperability and innovation across a wideswath of vendors and protocols. Thanks to ORAN, we even see Nokia andEricson committing to making their previously closed off solutionsinteroperable with each other. Now different vendors can supplydifferent parts of the cellular chain such as the Radio, the Basebandunits and the Core. However, there is still a big gap between thepotential of ORAN and capabilities especially on the hardware side ofthe equation such as 5G Radio Chipsets for base stations.

PhasorLab's patented Hyper Sync Net (HSN) technology for Position,Navigation and Timing (PNT) applications has been demonstrated toprovide as high as picosecond level sync without using Atomic clocks.

Parallel Wireless and PhasorLab have collaborated to develop the designfor a 4G Base-station that can operate without a GPS connection.

Challenge: 5G Location Accuracy Goal in Release 16 is sub-meter-levelbut does not specify how to reach it

Innovation: HSL adapts our proven Hyper Sync Network (HSN) technologyfor 5G. HSN has demoed 30-cm accuracy from sub-nanosecond clock syncaccuracy and is a 100% wireless solution to the US DoT in March 2020

Key benefits: High accuracy localization is the key to asset trackingand logistics. Current 4G/LTE provide only 100 feet of location errorwhich is not viable for AR/VR applications without using GPS.

Challenge: Every cellular station needs a timing source to sync itslocal clock. Most use GPS or a wired protocol (e.g. IEEE1588)

Innovation: We provide a GPS-free Jammer-Resistant and fully wirelessclock synchronization solution using HSN as a TFDS (Time and FreqDistribution System) for 5G base stations

Key benefits: Jamming a GPS signal is trivial and costs only $300 inCOTS hardware. Wireless HSN enables deployment in remote areas that donot have wired connections for IEEE 1588.

Challenge: Seamless connectivity between mobile nodes and dismountsneeds location information for handoffs

Innovation: Our solution enables fine grained localization and time syncacross 5G base stations that may be miles apart without using expensiveAtomic Clocks or adding fiber connections

Key benefits: Knowing where any blue force UE provides full situationalawareness and also helps with active beam steering and handovers formobility

Challenge: Adversaries are likely to jam GPS signals and cellularfrequencies

Innovation: In addition to active beam steering, tighter clock sync willenable agile frequency hopping strategies and our options enable preciselocalization of rogue signals

The primary objectives of our 5G HSL project are:

Demonstrate sub-meter positioning accuracy utilizing our 5G HSLtechnology via:

Deliver High-Precision Wireless Synchronization Solutions (HSN) to 5GNetwork

Implement 5G Cellular Positioning System utilizing SRS packets forUTDOA-based Localization Technique Utilizing HSN for NetworkSynchronization

Expand HSN roles to become extra listening nodes as part of the 5Gnetwork as well as being synchronization resource.

Expand HSL solution to track inexpensive WiFi devices using the samehardware (optional)

The inventors have contemplated solutions to the following challenges.

1. Computational Limits: What is the best accuracy possible on today's4G and 5G hardware and best-in-class algorithms? The actual calculationdone to estimate the location is typically done today in a centrallocation that has information from multiple cell towers. How should itbe done in a secure manner that is efficient and privacy friendly? Whichparts of the compute can be distributed? How much communication overheadis needed?

2. Security and Privacy: One of the challenges not covered in ouroverview is that commercial cellular solutions have several privacysafeguards and legacy quirks.

3. Legacy Applications and Infrastructure: How should our systeminteract with the existing commercial location tracking servicesavailable and deployed already in the US and other countries. Can othervendors use our new innovations too?

The rest of this proposal document will go into more technical depth onhow we achieve our objectives and plan to address all three of thesechallenges in our HSL approach. Our goal is to minimize privacy risks,maximize accuracy and interface with popular location applicationsolutions in use today.

2. TECHNICAL BACKGROUND

4G and 5G Localization Capabilities Today versus HSL:

The 4G and 5G standards have well defined Positioning Protocols todetermine the position of connected User Equipment (UE). The currentstate of the art deployed in practical 4G systems provides positioningaccuracies in the order of +−100m. 5G systems have the potential toincrease the accuracy to the order of 10s of meters.

Uplink Time Difference of Arrival (UTDOA): One of the well-knownapproaches to locating a UE is to triangulate its position from a set ofat least 3 (4 for fixing elevation in addition) sufficiently separatedreference positions. If the reference positions are precisely known andthe distance of the UE from each of these reference positions is alsoprecisely known, the UE can be located precisely by mathematicalmethods. Uplink Time Difference of Arrival (UTDOA) is a specific methodof implementing this concept. This is shown in system 100 of FIG. 1.Fundamentals of Cellular Time-difference of Arrival or TDOA-basedLocalization. Cellular UE could be anywhere in central circle 101denoting the location estimation error.

In the UTDOA method, the UE is scheduled by the gNB/eNB to transmit aspecific waveform. The listening nodes are synchronized tightly.Listening nodes are positioned at precisely known locations. Thelistening nodes decode the waveform and mark the time at which thewaveform was received. Since the waveform originated from the UE at acommon instant in time but was received by the listening stations atdifferent instants in time due to difference in the distances the RFsignal has to traverse to reach the listening stations, the relativedifference in arrival times translates to the relative path lengthdifference from the UE to each of the listening nodes. Thus, theingredients required to triangulate the UE's position are available.

If the positions of the listening nodes are known with GPS co-ordinates,the UE's position can be known accurately in GPS co-ordinates. If thepositions of the listening nodes are only known relative to one another,say when GPS is unavailable, the location of the UE can still be knownrelative to the position of the listening nodes.

PW's solution uses the UTDOA method but brings the following novelties:

High precision location of <1 m accuracy since the HyperSync Networksynchronizes the timing on each of the listening stations extremelyaccurately.

The accuracy of estimation of relative time difference of arrivalrequires as little multipath dispersion as possible. PW's listeningstations are inexpensive and can be deployed in appropriate numbers tohave direct line of sight to the UE. In addition, our delay estimationalgorithm utilizes Super Resolution Techniques on SRS special packets,which allows separating Direct-Line-of-Sight signal delay from the othermultipath elements.

Unlike other synchronization mechanism, the Hypersync network nodescommunicate wirelessly. Thus, it is perfectly suited for ad-hoc, just-intime, network-in-a-box type deployments in remote and hostile areas.

PW solution interfaces to upstream location-based services endpointsusing 3GPP standards defined interfaces. This is critical so thatexisting location services used for 911 call location tracking continueto work seamlessly with HSL for maximal commercial viability of oursolution.

PW solution can work with other waveforms distinct from 5G if sodesired.

We now present some more details on HSN since it is a key enablingcomponent inside the HSL solution as described above and realizing ourclass-leading sub-meter location accuracy.

HSN System Overview

FIG. 2 shows an example of a Self-Organizing Hyper sync Mesh Network200. In this example the network is formed with two grand master nodes,a plurality of slave nodes and a plurality of access points.

Some of the unique features of our HSN are:

High-precision Blind Carrier Synchronization algorithm

Highly efficient high-resolution interpolation technique

High-precision delay estimation and time stamping techniques

Super-Resolution MP algorithm for multipath detection

Enhanced ranging resolution through frequency diversity

Self-Organizing, Mobile, High-Precision Time, Frequency DistributionSystem (TFDS)

Provides GPS-Independent APNT Solution to the entire mobile mesh networkin real-time:

Highly Robust Against Jamming or Spoofing through: SynchronizedFrequency Hopping, Self-Organizing, Self-Healing, and Redundant MeshArchitecture.

Instantaneous Doppler Shift measurement capability for accurate velocitytracking

Reduced cost and SWaP by eliminating the dependence on Chip Scale AtomicClocks (CSAC) as Synchronization solution, and available asBattery-Powered Portable Units.

Fully Networking Ready: multi-hop, peer-to-peer packet exchange.

Our current uses HSN nodes and relays in the 2.4 GHz band. In thisproject, we proposed to explore different designs to integrate HSN withPW's 5G gNodeB using open source 4G and 5G gNodeB solutions, thusbringing our synchronization and localization capabilities to 5Gproducts and solutions.

HSN Key Features Benefits Self-Organizing, Provides GPS-Independent PNTSolution in Self-Healing Mobile, real-time that is scalable anddistributable High-Precision Time, Frequency Distribution System (TFDS)3D Mapping Capability 3-D map of the entire mesh network is constantlyupdated as a byproduct of maintaining high-precision synchronizationthroughout the Mesh Network Low Cost and SWAP Affordable and portable,yet as (5″ × 4″ × 1″ in accurate as much more expensive current form)Chip-scale atomic clocks (CSACs ). Each HSN node costs less than $1000Self-Organizing, Self- Proven resistance against jamming and Healing,Synchronized spoofing attacks Tested by US Govt at Frequency Hopping,DHS JamX'17 event Redundant Wireless Mesh Architecture InstantaneousDoppler Enables accurate velocity tracking Shift measurement capability.Frequency agnostic Can be adapted for use in other frequency bands forunderground applications or in conjunction with custom radios Additionalout of As an added bonus, HSN is capable of multi- band Data hop,peer-to-peer packet and data transfers Networking Capability foradditional C2 channel capabilities

Our existing HSN solution has been tested over multiple hops within amesh network utilizing conventional 2.4 GHz wireless channels while justusing 15 MHz of bandwidth in a highly efficient manner. We can useeither unlicensed (WiFi bands) or licensed radio channels. Our HSNsolution effectively eliminates the need for expensive time-referenceequipment such as atomic clocks, CSACs, GPS-trained OCXOs, etc., andprovides an unlimited number of high-precision time and frequencyreference nodes utilizing our economical wireless solution. In addition,our highly robust self-organizing and self-healing network features arewell suited to deliver a highly reliable PNT solution that can withstandmost traditional jamming or spoofing attacks.

FIG. 3 shows an embodiment 300 of an HSN Football field demo using adrone 301 highlights our 3D position mapping capability withsub-meter-level accuracy. A group of people 302 a,302 b, 302 c and 302 dare shown at various locations on the field 300. HSN anchors are shownas stars 303 a, 303 b, 303 c and 303 d. The system allows any HSN nodeto act as an anchor or client or as both. HSN provides both timing andposition localization capabilities.

HSN for High-Precision Cellular-Network UE Localization

Proposed use of HSN for 5G Cellular

HSN as Wireless Version of IEEE 1588

HSN as Listening Only Nodes

HSN Positioning Algorithm

Time Domain

Frequency Domain

Positioning Algorithm Research

HSN for Cellular Network Synchronization (“Wireless PTP”)

There are two typical ways of achieving time synchronization for thecellular base stations. As the common first option the outdoor basestations are equipped with a GPS receiver which typically delivers up totens of nanosecond synchronization. When GPS is not available thetypical secondary alternative that is the IEEE 1588 Precision TimeProtocol (PTP) which is a wired solution. Trying to achieve equivalentsync quality as GPS via IEEE 1588 is typically challenging and veryexpensive resulting in inferior sync quality more often than not. Incontrast, our Hyper Sync Net can be deployed highly economicallydelivering superior synchronization qualities to the entire cellularnetwork. Our solution results in actually better sync quality than theGPS-based solution. Since most of the base stations are not equippedwith expensive GPS-trained crystals (OCXOs) the typical sync qualitybetween BSs are tens of nanoseconds at best. Our HSN, on the other handmaintains virtual time and frequency lock between base stations;therefore, it is an ideal candidate for a secondary time source as abackup to GPS. Our HSN can be thought of as the “Wireless PTP”delivering superior outcome than wired IEEE 1588 version of PTP.

HSN for High-Precision Cellular-Network UE Localization

Sounding Reference Signals (SRS) that UE transmits for the sake ofChannel Estimation and other needs can be used to measure the Time ofArrival at Base Stations. 5G seems to have expanded the SRS features sothat it can occupy wider BW and multiplex to capture multiple users atonce, etc. So, this gives us a good means to do Uplink TDOA for UEpositioning without requiring any UE involvement. In order to realizethis network-based high-precision positioning the following featureswould be required.

All the listening BSs will need to be highly TimeSynchronized—PhasorLab's HSN is an excellent candidate for this need(Wireless 1588 enabler in a box ready for daisy chains).

Since it's likely that there are not enough BSs to produce TDOAmeasurements for a given UE location, we′d like to propose to deploy“Listening-Only Base Stations” which is part of the network but onlyresponsible for (a) maintaining Time Sync and (b) measuring the arrivaltime of UE signals based on their SRS packets.

These time stamping data can be sent to eNB or other main network serverto run positioning algorithms and compile position data for all UEs.

In one embodiment, system hardware consisting of SDR from Analog Devicesand an FPGA. Each node of our Mesh Network uses identical hardwareregardless of whether it's a master anchor or mobile UE. A few differentantennas used are also shown along with a 10-foot tri-pot used formounting anchor nodes.

Key innovation: “Sub meter Localization Accuracy for 5G gNodeB” systemthat does not require any UE modification by exploiting 5G SRS feature,will work with existing location services and privacy restrictions,allows improved coverage by “5G listen-optimized nodes” deployed as andwhen needed wirelessly, can use the same hardware to also performsub-meter WiFi localization, and does not use GPS or other locationsensors. The HSL 5G gNodeB is 100% ORAN-compatible as well.

How to improve 5G location without changing the 5G standard or UE: isshown in the environment 400 of FIG. 4. One of the most innovativeaspects of our proposal is our ability to improve 5G locationcapabilities using our custom HSL solution, but without modifying 5Ghandsets or existing protocols. They key to this approach isunderstanding and exploiting the SRS capabilities of the 4G and now 5G3gpp standards. Parallel Wireless is one of the few companies that canmanufacture and modify both the software and hardware of the entirecellular stack. We present some fine-level details to highlight ourknowledge of this domain and how we will apply it in this proposal.

SRS: Sounding reference signal (SRS) is a physical-layer waveformdesigned in 4G LTE for the UE to transmit in the uplink communicationwith the eNB. The SRS waveform is designed for multiple purposes: 1.) Toenable the eNB learn the uplink channel conditions from its active usersfor both TDD and FDD as this allows the eNB in LTE and gNB in 5g, toperform uplink channel quality measurements, interference conditionsdetermination, and frequency-selective scheduling. 2.) To enableclosed-loop link adaptation between the UE and the eNB to optimallyallocate the modulation and coding schemes and to increase the linkefficiency for both TDD and FDD. The eNB does this by computing thesignal-to-noise-plus-interference ratio (SINR) and then mapping thisSINR to the target modulation and coding rate subject to the allocation(or the number of resource blocks used for the UE) constraint.

To compute the downlink precoder weights based on uplink SRStransmission by leveraging the channel reciprocity of a TDD carrier.This is a defining feature of TDD as due to subframe partition betweenthe UE and the eNB, our goal is to reduce the signaling overhead inestimating the precoding matrix to be applied for downlink single-userand multi-user MIMO transmission. And most importantly: To enablehigh-resolution signal processing to estimate the angle of arrival(AoA), angle of departure (AoD) and the location of the user. This ispossible because the SRS bandwidth can be configured by the gNB with amaximum SRS bandwidth equal to the LTE system bandwidth. For 18 MHzoccupied LTE bandwidth with 20 MHz channel bandwidth, the one-waytheoretical location accuracy is 16.6 meters.

The Sounding Reference Signals can be spaced at fixed spacing across theentire bandwidth. Think of it as fine toothed comb in the frequencydomain spanning the entire bandwidth. In some embodiments, the listeningdevices would get information about a given UE's SRS waveform from thescheduler in the controlling base station and thereby, have theinformation to listen to the sounding signal. As the base station hasthe ability to ask for a sounding signal that consumes fullcarrier-width, this enables sounding signals to be used for positioning.

In some embodiments, listen-only base stations may also be used, so thatthe SRS method is able to be used by a listen-only node capable of 5Glistening without requiring the full overhead of a 5G base station.

In our current product deployments, we already support the SRS for thepurposes 1) through 3) above. As part of our current proposal, we planto leverage SRS for precise location determination for proposed new 5Gproducts in our design and development phase.

The SRS waveform in LTE is based on Zadoff-Chu sequences which have theproperty that the cross-correlation of the sequence with its non-zerocyclic shifts is identical to zero. For frequency-flat channels over thespan of the SRS bandwidth, this property allows for uniqueidentification of each SRS waveform, and subsequently precise timelocalization of the UE transmitting that SRS waveform.

FIG. 5 shows the structure of a subframe with SRS transmission 500.Here, the LTE subframe is divided into two slots. The subframe durationis 1 msec whereas the slot duration is 0.5 msec. Each slot carriers 7symbols out of which 6 symbols are to carry the data from the UE to theeNB while the central symbol in each slot contain the demodulationreference symbol that is exploited by the eNB to perform channelestimation, noise and interference estimation, and equalization. Whenthe eNB configures the sounding reference signal, the last symbol in the2nd slot is not used for data transmission. Instead, the last symbol inthe second slot will be used to transmit the SRS waveform. Another pointto keep in mind is that it is possible to only configure the SRS userswith no data to transmit in which case only the SRS symbol will betransmitted in the last symbol portion of the subframe. The SRStransmission bandwidth can be configured to be either the same asdifferent from the bandwidth used for data transmission. Thisdistinction will be exploited in our proposal to realize high-accuracylocation estimation for different users by dynamically changing the SRSbandwidth. For multi-antenna transmissions from the UE, SRS is expectedto be transmitted from each transmit antenna. However, since LTE uplinkis primarily limited to single-antenna transmission, in this proposal wetoo will first focus on the single-antenna SRS transmission.

Processing of the SRS waveform: The SRS waveform undergoes the sameSC-FDMA modulation as the rest of the data channels (such as PUSCH andPUCCH). This waveform goes through a frequency-selective fading channeland is further corrupted by intentional interference (i.e., due to otherUEs in the sector of interest) and unintentional interference (i.e., UEsin the other sectors), and then external jamming prior to perturbed byadditive noise at the receiver frontend.

The received time-domain signal is processed through a series oflow-noise amplifiers, filters, and A/D converters and then passedthrough a bank of FFT processors (one FFT per receive antenna) to obtainthe frequency-domain received waveform. Only the tones within theallocated bandwidth are retained (i.e., 1200 loaded tones from a 2048FFT for a 20 MHz LTE system). Since the eNB knows the allocationinformation (i.e., subframe number and resource block positions) of theSRS transmissions, it extracts the frequency-domain SRS symbols acrossall the receive antennas corresponding to the SRS allocation.

Ideally, the eNB can apply high-resolution signal processing (HRSP)algorithms such as MUSIC (multiple signal classification) or ESPRIT(estimation of signal parameters via rotational invariant techniques) toextract AoA, AoD, timing and distance information. However, to notcomputationally burden the eNB we propose to compress the SRS samplesand transmit to a central processing unit for dedicated HRSP task.

To summarize, our team has studied this problem in depth and understandexactly how to build and a custom 5G gNodeB that will be optimized toprovide unprecedented accuracy by coupling our knowledge of the SRSwaveform that is standard in the 3gPP enhanced with our ability tosynchronize time between multiple base stations at the sub-nanosecondlevel.

Putting it all Together: The Complete HSL System.

Now that we have described the fundamentals of our solution names HSNand SRS, we discuss how we will demonstrate HSL in a solution byintegrating these complementary technologies into a custom HSL-ready 5GgNodeB. Our solution will work with just one base station but for bestperformance we require three of our nodes to enable signaltriangulation.

FIG. 6 shows the HSL solution 600 can be integrated into and deployed byany ORAN-compatible cellular OEM. The PW HSL assisted Location Servicessolution encompasses a system that interfaces to the 3GPP standardsdefined E-SMLC. The PW solution interfaces with the E-SMLC using the3GPP standards defined LPPa protocol.

HSL Key Components: The HSL solution consists of the followingcomponents:

PW 5G gNB (also works with 4G).

PW Hetnet Gateway that virtualizes/abstracts a collection of PW basestations and provides the complex network under its purview as a simplebase station to the mobile packet core network.

The PW HetNet Gateway is a software solution that runs on commodityservers.

The PW HetNet Gateway also hosts the Location Based ServicesIntelligence and Algorithms.

HSN Nodes that perform the dual role of listening to UEs for the purposeof locating the UEs and for synchronizing the clocks on the PW gNB withthe collection of HSN listening nodes, or other gNBs.

HSL System Operation Workflow: The solution is architected as follows:

HSN network is always operational and keeps the clocks on the gNB andlistening stations perfectly synced using a wireless channel to achievethis mechanism.

When the location of a UE is to be determined, a request arrives at thePW-HNG, 5, from the E-SMLC Server, 6.

The PW Location Server issues instructions to the gNB to schedule aspecific waveform transmission for the UE of interest. This waveform isthe Sounding Reference Signal, a standard defined UE uplink waveform.

The PW Location Server issues instructions to the listening nodes tolisten for this imminent waveform.

At the appointed time, the UE starts transmission of the waveform. Thelistening nodes listen to the waveform and estimate the delay inreceiving the signal against a common reference of time. The individualpaths traversed by that identical waveform is shown in 3.

The listening nodes report the delay as metadata to the PW LocationServer along wireless (or wired ethernet where available) paths 4.

The PW-location server pinpoints the location of the UE and conveys thisinformation to the E-SMLC as a location relative to the PW gNB'slocation.

The E-SMLC proceeds to report the location of the UE as per its definedbehavior.

Analysis of Expected HSL Geolocation Accuracy and Performance:

Using existing LTE positioning method as a comparison, below samplecalculation highlights the expected improvements in positioning accuracyas we evolve toward utilizing Sounding Reference Signal (SRS) as thearrival time estimation and superior time synchronization proposed byadopting HSN for 5G. A good theoretical estimation of positioning errorsin LTE network is compare to what we can expect utilizing our 5Gsolution with HSN in below sample calculations. The representativevalues used below for typical error sources in LTE solution comes from[Q3].

UE's OTDMA measurement uncertainty relying on time-stamping PRS signalsfrom two base stations for LTE: σ_UE=˜40 m However, migrating toSRS-based positioning this uncertainty no longer comes into calculationas the new method relies on Uplink OTDMA.

Decent value for Geometric Dilution of Precision (GDOP) parameter whichrepresents how well the listening base stations are positioned for atarget UE: GDOP=0.9 We will use the same GDOP figure for comparison.

Base stations's synchronization accuracy for LTE: σ_(BS)=˜15 m m For oursolution, this number goes below 0.3 meters (less than 1 ns in timesync)

eNB's antenna coordinate accuracy: σ_(ANT)=˜3 m. For our PACE solutionthis term will also vanish to a centimeter-level or better.

Expected Multipath excess delay to be ˜0.1 us (suburban): σ_(MP)=˜30 m.Our proposed solution also removes any multipath effects by virtue ofphased array antennas as well as super resolution algorithms beingadopted by the extra listening-only nodes.

Adding all these sources of errors together, LTE based solution gives:

$\sigma_{SUM} = {\sqrt{\sigma_{UE}^{2} + \sigma_{BS}^{2} + \sigma_{ANT}^{2} + \sigma_{MP}^{2}} = {\sim {52\mspace{14mu} m}}}$σ_(TOT) = GDOP ⋅ σ_(SUM) = 0.9 × 52 =  ∼ 47  m

In comparison, our PACE+HSN solution, the positioning error estimatesare:

$\sigma_{SUM} = {\sqrt{\sigma_{BS}^{2} + \sigma_{ANT}^{2} + \sigma_{MP}^{2}} = {\sqrt{0.3^{2} + 0.1^{2} + 0.5^{2}} = {\sim {0.59\mspace{14mu} m}}}}$σ_(TOT) = GDOP ⋅ σ_(SUM) = 0.9 × 0.59 =  ∼ 0.53  m

In comparison, for our PACE+HSN solution, the positioning errorestimates are:

$\sigma_{SUM} = {\sqrt{\sigma_{BS}^{2} + \sigma_{ANT}^{2} + \sigma_{MP}^{2}} = {\sqrt{0.3^{2} + 0.1^{2} + 0.5} = {\sim {0.59\mspace{14mu} m}}}}$σ_(TOT) = GDOP ⋅ σ_(SUM) = 0.9 × 59 =  ∼ 0.53  m

FIG. 7 is a flow diagram of a method for sounding signals for sub-meterbase station localization, in accordance with some embodiments. Themethod begins with processing block 701 which discloses receiving, at aHetnet Gateway (HNG) from an Evolved Serving Mobile Location Center(E-SMLC) server located in a network, a request for a location of a UserEquipment (UE). The HNG hosts location based services intelligence andalgorithms.

Processing block 702 shows issuing, by the HNG to a base station,instructions to schedule a Sounding Reference Signal (SRS) transmissionfor the UE. the base station comprises a one of a 4G eNodeB and a 5GgNodeB (gNB).

Processing block 703 recites issuing, by the HNG, instructions to aplurality of Hyper Sync Network (HSN) nodes to listen for the SRStransmission from the UE. The HSN node comprises a listen only basestation for maintaining time synchronization and an arrival time of UEsignals.

Processing block 704 states transmitting, by the UE at an appointedtime, the SRS transmission.

Processing block 705 discloses listening, by the HSN nodes, for the SRStransmission and estimating a delay in receiving the transmissionagainst a reference time.

Processing block 706 shows reporting, by the HSN nodes, the delay asmetadata to the HNG.

Processing block 707 recites determining, by the HNG from the metadata,a location of the UE relative a location of the base station.

Processing block 708 discloses reporting, by the e-SMLC, the location ofthe UE.

The clocks on the base station and HSN nodes are synchronized using awireless channel.

In conclusion, by combining PhasorLab's HSN technology with PW's 5GCellular Solution, and supported by analysis provided here, HSL willsignificantly advance the state of the art in 5G geolocation inGPS-denied and indoor environments and significantly benefit commercialcustomers from sub-meter or better accuracy.

In some embodiments, the software needed for implementing the methodsand procedures described herein may be implemented in a high levelprocedural or an object-oriented language such as C, C++, C#, Python,Java, or Perl. The software may also be implemented in assembly languageif desired. Packet processing implemented in a network device caninclude any processing determined by the context. For example, packetprocessing may involve high-level data link control (HDLC) framing,header compression, and/or encryption. In some embodiments, softwarethat, when executed, causes a device to perform the methods describedherein may be stored on a computer-readable medium such as read-onlymemory (ROM), programmable-read-only memory (PROM), electricallyerasable programmable-read-only memory (EEPROM), flash memory, or amagnetic disk that is readable by a general or specialpurpose-processing unit to perform the processes described in thisdocument. The processors can include any microprocessor (single ormultiple core), system on chip (SoC), microcontroller, digital signalprocessor (DSP), graphics processing unit (GPU), or any other integratedcircuit capable of processing instructions such as an x86microprocessor.

In some embodiments, the radio transceivers described herein may be basestations compatible with a Long Term Evolution (LTE) radio transmissionprotocol or air interface. The LTE-compatible base stations may beeNodeBs. In addition to supporting the LTE protocol, the base stationsmay also support other air interfaces, such as UMTS/HSPA, CDMA/CDMA2000,GSM/EDGE, GPRS, EVDO, other 3G/2G, 5G, legacy TDD, or other airinterfaces used for mobile telephony. 5G core networks that arestandalone or non-standalone have been considered by the inventors assupported by the present disclosure.

In some embodiments, the base stations described herein may supportWi-Fi air interfaces, which may include one or more of IEEE802.11a/b/g/n/ac/af/p/h. In some embodiments, the base stationsdescribed herein may support IEEE 802.16 (WiMAX), to LTE transmissionsin unlicensed frequency bands (e.g., LTE-U, Licensed Access or LA-LTE),to LTE transmissions using dynamic spectrum access (DSA), to radiotransceivers for ZigBee, Bluetooth, or other radio frequency protocolsincluding 5G, or other air interfaces.

The foregoing discussion discloses and describes merely exemplaryembodiments of the present invention. In some embodiments, softwarethat, when executed, causes a device to perform the methods describedherein may be stored on a computer-readable medium such as a computermemory storage device, a hard disk, a flash drive, an optical disc, orthe like. As will be understood by those skilled in the art, the presentinvention may be embodied in other specific forms without departing fromthe spirit or essential characteristics thereof. For example, wirelessnetwork topology can also apply to wired networks, optical networks, andthe like. The methods may apply to LTE-compatible networks, toUMTS-compatible networks, to 5G networks, or to networks for additionalprotocols that utilize radio frequency data transmission. Variouscomponents in the devices described herein may be added, removed, splitacross different devices, combined onto a single device, or substitutedwith those having the same or similar functionality.

Although the present disclosure has been described and illustrated inthe foregoing example embodiments, it is understood that the presentdisclosure has been made only by way of example, and that numerouschanges in the details of implementation of the disclosure may be madewithout departing from the spirit and scope of the disclosure, which islimited only by the claims which follow. Various components in thedevices described herein may be added, removed, or substituted withthose having the same or similar functionality. Various steps asdescribed in the figures and specification may be added or removed fromthe processes described herein, and the steps described may be performedin an alternative order, consistent with the spirit of the invention.Features of one embodiment may be used in another embodiment. Otherembodiments are within the following claims.

1. A system providing base station localization, comprising; a networkincluding base station; a Hetnet Gateway (HNG) in communication with thebase station, wherein the HNG includes a location server and wherein theHNG virtualizes and abstracts a collection of base stations and providesa complex network under its purview as a simple base station to a mobilepacket core network; a plurality of Hyper Sync Network (HSN) nodes incommunication with the base station and the HNG, wherein the pluralityof HSN nodes listen to User Equipments (UEs) to locate the UEs and tosynchronize clocks on the base station with the collection of HSN nodesor other base stations; and an Evolved Serving Mobile Location Center(E-SMLC) server in communication with the HNG and for reporting thelocation of a UE.
 2. The system of claim 1 wherein the base stationcomprises a one of a 4G eNodeB and a 5G gNodeB (gNB).
 3. The system ofclaim 1 wherein the HNG hosts location based services intelligence andalgorithms.
 4. The system of claim 1 wherein the network keeps clocks onthe base station and HSN nodes synchronized using a wireless channel. 5.The system of claim 1 wherein the HNG issues instructions to the basestation to schedule a Sounding Reference Signal (SRS) transmission forthe UE of interest.
 6. The system of claim 5 wherein the HSN nodeslisten to the SRS transmission and estimate a delay in receiving thesignal against a common reference of time.
 7. The system of claim 6wherein the HSN nodes report the delay as metadata to the HNG.
 8. Thesystem of claim 7 wherein the HNF pinpoints the location of the UE andconveys this information to the E-SMLC as a location relative to thebase station's location.
 9. The system of claim 1 wherein the HSN nodecomprises a listen only base station for maintaining timesynchronization and an arrival time of UE signals.
 10. A method forproviding base station localization, the method comprising; receiving,at a Hetnet Gateway (HNG) from an Evolved Serving Mobile Location Center(E-SMLC) server located in a network, a request for a location of a UserEquipment (UE); issuing, by the HNG to a base station, instructions toschedule a Sounding Reference Signal (SRS) transmission for the UE;issuing, by the HNG, instructions to a plurality of Hyper Sync Network(HSN) nodes to listen for the SRS transmission from the UE;transmitting, by the UE at an appointed time, the SRS transmission;listening, by the HSN nodes, for the SRS transmission and estimating adelay in receiving the transmission against a reference time; reporting,by the HSN nodes, the delay as metadata to the HNG; determining, by theHNG from the metadata, a location of the UE relative a location of thebase station; and reporting, by the e-SMLC, the location of the UE. 11.The method of claim 10 wherein the base station comprises a one of a 4GeNodeB and a 5G gNodeB (gNB).
 12. The method of claim 10 furthercomprising hosting, by the HNG, location based services intelligence andalgorithms.
 13. The method of claim 10 further comprising keeping clockson the base station and HSN nodes synchronized using a wireless channel.14. The method of claim 1 wherein the HSN node comprises a listen onlybase station for maintaining time synchronization and an arrival time ofUE signals
 15. A non-transitory computer-readable media containinginstructions for providing base station localization which, whenexecuted, cause a system to perform steps comprising: receiving, at aHetnet Gateway (HNG) from an Evolved Serving Mobile Location Center(E-SMLC) server located in a network, a request for a location of a UserEquipment (UE); issuing, by the HNG to a base station instructions toschedule a Sounding Reference Signal (SRS) transmission for the UE;issuing, by the HNG, instructions to a plurality of Hyper Sync Network(HSN) nodes to listen for the SRS transmission from the UE;transmitting, by the UE at an appointed time, the SRS transmission;listening, by the HSN nodes, for the SRS transmission and estimating adelay in receiving the transmission against a reference time; reporting,by the HSN nodes, the delay as metadata to the HNG; determining, by theHNG from the metadata, a location of the UE relative a location of thebase station; and reporting, by the e-SMLC, the location of the UE. 16.The computer readable media of claim 15 further comprising instructionswherein the base station comprises a one of a 4G eNodeB and a 5G gNodeB(gNB).
 17. The computer-readable media of claim 15 further comprisinginstructions for hosting, by the HNG, location based servicesintelligence and algorithms.
 18. The computer-readable media of claim 15further comprising instructions for keeping clocks on the gNB and HSNnodes synchronized using a wireless channel.
 19. The computer-readablemedia of claim 15 further comprising instructions wherein the HSN nodecomprises a listen only base station for maintaining timesynchronization and an arrival time of UE signals